Heating control



Jan. l, 1946. R. .L PARSONS HEATING CONTROL Filed June 25, 1944 INVENTOR.

ATTOQ/VEY Patented Jan. 1, 1946 lulrnriso sTA-TEsPATENT OFFICE HEATING CONTROL 1,5.' I l I Robert J. Parsons, Schenectady, N. Y., assigner to, Consolidated Car Heating Company, Inc., Alv b any, N. VY., a corporation of New York Application June 23, 1944, Serial No. 541,825 i4 Claims. tcl. 236-76) 'Y This invention relates to heating and ventilating, `particularly heating and Ventilating of' a vehicle, such as a bus or street car.

A principal object of this invention is the pro- -vision ol a construction and arrangement whereby heated air ilowing in a conduit to a space to be heated and ventilated may be diverted to a bypass, more or less, by a valve or damper which vmay be regulated minutely to a plurality of positions.

Other objects and advantages will appear as 'thedescription of the particular physical embodiment selected to illustrate the invention pro- -gres'ses and novel features will be particularly pointed out in the appended claims.

In describing the particular physical embodiment selected to illustrate the invention, refer- 'ence will be had to the accompanying'drawing, consisting of a singleschematic or diagrammatic view, and to the characters of reference thereon. i Numeral I designates a valve or damper pivoted at 2 and adapted to completely close the gpeiing 3 in a duct 4 or to completely close the uc -1 The duct 4 connects to a source of heated air Y at one end and at the other end leads to a space to be heated or ventilated,

The damper 4 'is operated by the linkage 5 'connected-to the armature of brushes .'I and 8 and iield coils 9 and l0. f i, The field coil 9 is so wound on the motor as to cause the motor to revolve lin such direction as to 'op'en the damper, that is, tovmove the damper in a direction so that the by-pass 3 will be opened more or less. The field coil I0 is so wound upon the motor that it causes the motor armature to revolve-in such' direction'as to close the damper I, that is, to move the damper so as to close the Icy-pass 3 more or less.

There is also provided an insulating drum I'I rotatable synchronously with the damper. 'Ihis drum has metallic segments I2, I3, I4, I5, I5 and i-l thereon, each being connected to a common wire return or'ground. Y

18, I9, 20, 2h22 `and 23 designate metallic brushes bearing upon the drum I'I and attimes -contacting the metallic `segments thereon to complete vcircuits to be hereinafter described.

24 designates a Sylphon or bellows type therfmostatic device positioned in the space to be heated .or ventilated 'and responding to the changes in temperature therein. I do not mean to'. exclude by a showing of the thermostatic device directly in the space to be heated and of th'e Sylphon or bellows type, theuse of a temperature a motor 6 having l* the negative terminal of the source.

responsive device positioned in the space to be heated and a connection therebetween and a bellows or Sylphon positioned at a more convenient place whereby the changes in temperature in the space to be heated are reflected by the remote Sylphon or bellows.

All of the parts shown in the drawing are assumed to be in the position which they would be in if the temperature in the space to be heated were G01/2 F.

If the temperature to which bellows 24 is exposed rises so that it becomes 61, then the bellows 24 will expand pushing link 25 to the right, as viewed in the figure. This will cause switch arm 26 pivoted at 21 to contact point 28. When this contact is made a circuit will be formed in which current will ow as follows: from the positive terminal of a source of potential, pivot 2l, switch' arm 2S, point 2S, wire 29, relay coil 30, brush 22, segment I6, and thence to common or Current iiowing in the above trace path will cause the relay armature 3l to be raised so that a circuit vwill be formed in which current will flow as follows: positive terminal of a source of potential, relay armature 3|, wire 32, opening iield coil 9, wire 33, brush l, armature 6, brush 8, and to the negative terminal of the source. Current flowing in the above trace path will cause the armature Ii to rotate and through linkage 5 move the damper I to the 61 position and synchronously move drum II. When metallic segment I4 moves under brush 20 a circuit will be formed as follows: positive terminal of the source of potential, winding 34 of a solenoid, Wire 35, brush 20, metallic segment I4 and to the negative terminal of the source. Current iiowing in the above traced path energizing solenoid winding 34 will cause core 36 to be drawn in against the tension of the spring 3l and strut 38 exerting a pressure in the direction to the left, as viewed in the gure, will cause `pivoted armature 39 to move, carrying point 28 with it so as to break contact with pivoted switch -arm 2B so that relay 30 will be deenergized and so the'opening field coilwill be deenergized'and the damper will be left in the 61 position.

If the temperature in the space to be heated rises to 62, then switch arm 26 will again contact point 2B and again relay 30 will be energized and opening iield coil 9 will again be energized to cause the motor to rotate and move the damper to the 62 position. When the damper 'reaches the 62 position, brush I9 contacts metallic segment I3 and a circuit will be formed as follows: positive terminal of a source of poten- If the temperature in the space to be heated,

now rises to 63, switch arm 25 will again contact point 28 and again relay coil 30 will be energized and opening coil 9 will bei energized to move damper I to the 63 position.l When the damper reaches the 63 position, brush 22 moves out of contact with metallic segment I6 and so relay coil 36 will become deenergized and the damper will be left in the 63 position.

' With all of the parts in the position which they havel assumed, as hereinbefore described with the `damper in the 63 position, vifthe temperature in the space to be heated falls, then switch arm 26 will move toward the left, as viewed inthe gure. It will continue moving to theleft'as the temperature falls Vto 62, 61, SG1/2 and not until it falls to 60 will any change in the device take place, When switch arm 26 assumes that position which it is intended to assume when the .temperature of the space to be heated falls, to 60, then switch arm 26 willlcontact point 42 and a circuit will be formed as follows: positive terminal of a source of potential, switch arm 26, point 42, wire 43, relay coil 44, wire 45, brush 23, metallic segment II and thence to thenegative terminal of the source. -Current flowing inthe above 'traced path will cause relay armature 46 to beraised thus forming a circuit as follows: positive terminal of a source of potential, relay armature 46,y wire 41, vclosing field l0, wire 33, brush 'I, armature 6, brush 8 and to the negative terminalgof the source. Current ilowing inthe above traced path will cause the armature 6 to move and through linkage' 5 Vmove damper I .from the 63 position to the 60 position. When it reaches the 60 position brush 2l will contact y V.metallic segment I and form a circuit as fol- '.lows:` positive terminal of a source of potential,

solenoid winding 48, wire 49, .brush 2l, metallic segment I5, and to the negative terminal of the source. Current flowing in the above traced path will cause solenoid core ,'49'to be moved to the right, as viewed in the figure, against'the tension of spring 56 and through strut 5I will move pivoted armature 52 so that lpoint 42 is moved out of contact with switch arm 26, thus breaking the circuit of relay coil 44 so that the motor will stop and the damper` I will be left in the 60 position.

If the temperature in the space to be heated further falls to 59, then switch arm 26 will again contact point 42 and will againv energize relay coil 44' and again cause theclosing field to operate the damper tothe 59 position. When the damper reaches the 59 position, brush I 6 contacts metallic segment I2v and a circuit is formed as follows :1 positive terminal of a source of potential, relay coil 53, wire 54, brush I8, metallic segvthe circuit of the relay coil 44 so that the damper I will be leftin the 59 position.

If now the temperature in the space to be heated falls to 58, switch arm 26 will again contact point 42 and again energize relay coil 44 and cause the closing iield coil to be energized and the motor to move damper I to the 58 position. When the damper reaches the 58 position, brush 23 is no longer in contact with metallic segment I'I so that relay coil 44 becomes deenergized, so that the damper is left in the 58 position. Y

As the damper moved from the 63 position toward and to the 58 position, relay coil 40 was deenergized in passing from the 62 position to Y the 61 position because brush I9 moved out of contact with the metallic segment I3, and as the damper moved from the 61 position to the 60E/2 position, the solenoid 34 became deenergized by brush moving out of contact with the metallic Y segment I4, so that point 28 would be in the po-` sition which yit was assumed to be in when all' parts were in the G01/2 position.

If now the temperature in the space-to be heated rises, no parts will change except -the switch arm 26 which will move gradually to the right, as viewed in the figure, until the .switch arm 26 again contacts point 28, whereupon the same operations will take place as the temperature increases as has been hereinbefore described.

When switch point 26 does again contact point 28 and .move the damper from the 58 position to the 61 position, solenoid 48 will becomedeenergized by brush 2| moving out of contact with metallic segment I5 and relay `coil 53 will become deenergizedby brush 18 moving out-of contact with metallic segment I2, thus restoring solenoid core 49 and relay armature 52 to the position as shown in the ligure. y -v From the hereinbefore given description it will also be apparent that ifV the temperature in the space to be heated has risen to any degree including 61 and'above, that if the temperature then falls, no change will take place in thev positioning of the parts until the temperaturev falls It will also be observed that if the temperature has fallen to 60 or below, that if it then rises, no change in the parts will take place-until it has reached 61. x Although I have particularly shown and described a reversible motor of the type in which there are separate Viield coils, one for rotation in one direction and the other for rotation in the other direction, nevertheless, I desire to have it understood that I do not exclude the use of other well known Atypes of reversible motors.

Although I have shown the switch arm 26 as a simple pivoted arm, nevertheless I desired to have it understood that I do notv mean to exclude the use of well-known snap-action switch arms.

From the hereinbefore given description, it will appear that I have provided a system in which I may -control a damper in connection with a duct supplied from a source of heated air and communicating with a space to be heated in such a way that when the temperature of theV space to be heated requires such action, I may by-pass a portion of the heated air iiowing in the duct so that it does not reach the space to be heated, and that when the temperature of the space to be heated requires it, I may allow all or certain portions of the volume-of heated air to ow to the space to be heated thereby regulating the temperatureof the It will also be observed that my method of op- -erations is such that I do not keep the damper constantly uctuating backward and forwards,

sadomaso choirs fotoin"tooo-1aadl iowoio'oiosiiig position. lkeep `the damper fullyopcnwhen the space to be 'heated is at a maximum temperature until the temperature in the space to be heated falls a substantial amount. On the other hand, afterI have fully closedthe dampert'o allow the full volume of heatedair to reach the space to be heated, 1 do not move the damper toward open position until there has been a substantial rise .of the temperature inthe space to be heated, that is, from 58 v ciple and construction thereof, nevertheless, Iedesirc to have it understood that the iormselected is. merely illustrative but does noty exhaust. the

.means underlying my invention.

.What I claim as new and desire to secure by -Letters Patent of the United States is:

1.,In a heating and Ventilating system, in combination: a thermostatic device positioned in a Vspace to be heated; a source of heated air, s duct formed with an opening in its side and extendine' from the sour-ceo! heated air to the space to be heated; a damper in the duct adapted to be moved to. a plurality of positions to close the bypass wholly or partially and to close or to open the duct wholly or partially; a motor having an armature and an opening iield winding and a closing ileld winding; connections between the armature and the damper whereby the damper is operated by the armature; an insulating drum mechanically connected to and oscillatable with the armature, said drum bearing a plurality of spaced metallic segments; electrical conducting brushes positioned to contact said segments in deilnite oscillated positions thereof; an opening eld relay and a closing held relay; a circuit closing arm connected to and movable by said thermostatic L device; two contact points, one positioned on one side o1' said circuit closing arm and the other positioned on the other side thereof; a source of electrical potential and conductors connecting it with the motor, the metallic segments, electrical conducting brushes, the relays, contact points and u circuit closing arms whereby when the circuit closing arm is moved in one direction the damper is moved toward open position and When moved .in the other direction the damper is moved toward closed position and means to prevent `further movement of the damper after it has assumed a position corresponding to the then position of the switch arm. l

2. In a heating and Ventilating system, in combination: a thermostatic device positioned in a space to be heated; a source of heated air; a duct formed with an opening in its side and extending from the source of heated air to the space to be heated; a damper in the duct adapted to be moved to a plurality of positions to close the bypass wholly or partially and to close or to open the duct wholly or partially; a motor having an armature and an opening field Winding and a closing ileld winding; connections between the armature and the motor whereby the damper is operated by the armature; an insulating drum mechanically connected to and oscillatable with the armature, said drum bearing a plurality of spaced metallic segments; electrical conductingv brushes positioned to contact said segments in 'uenoiio 'osoiiiatea positions thereof; an. opening ileld relay and a closing ilel'd relay;` a circuit closing arm connected to and movable by said thermostatic device; two contact points, one posi- V'tioned on one side of said circuit closing arm and the otherpositloned on the other side thereoi-fa source of electrical'potential and conductors connecting the several devices whereby when th'ecircuit closing arm is moved in one direction Athe damper is moved toward open position and when moved in the other direction the damper is moved toward closed position, means to prevent further movement of the damper after it has assumed a position corresponding to the then position of the switch arm, two centrally pivoted levers, one bearing one contact and the other bearing the other contact; two pairs o! electro-magnetic devices,

, one pair cooperating withone pivoted lever and one with theother;` one of each pair positioned to act on its associated pivoted lever above the pivot and one of each pair positioned toact on its associated pivoted lever below the pivot and both positioned and connected to move the pivoted lever above the pivot in the same direction away from the circuit closing arm and means for energizing said electro-magnetic devices, one pair when the damper is being opened and the other pair when the damper is being closed at predetermined positions of the damper. 3. In a heating and Ventilating system, in combination: a thermostatic device positioned in a space to be heated; a source of heated air, a duct formed with an opening in its side and extending from the source of heated air to the space to be heated; a damper in the duct adapted to be moved to a plurality of positions to close the by-pass wholly or partially and to close or to open the duct wholly or partially; a motor having an armature and an opening eld winding and a closing ileld winding; connections between the armature and the motor whereby the damper is operated by the armature; an insulating drum mechanically connected to and oscillatable with the armature, said drum bearing a plurality of spaced metallic segments; electrical conducting brushes positioned to contact said segments in definite oscillated positions thereof; an opening iield relay and a closing ileld relay; a circuit closing arm connected to and movable by said thermostatic device; two contact points, one positioned on one side of said circuit closing arm and the other positioned on the other side thereof; a source of electrical potential and conductors connecting the several devices whereby when the circuit closing arm is moved in one direction the damper is moved toward open position and when moved in the other direction the damper is moved toward closed position, means to prevent further movement of the damper after it has assumed a position corresponding to the then position of the switch arm, two centrally pivoted levers, one bearing one contact and the other bearing the other contact; two pairs of electro-magnetic devices, one pair cooperating with one pivoted lever and one with the other; one of each pair positioned to act on its associated pivoted lever above the pivot and one of each pair positioned to act on its associated pivoted lever below the pivot and both positioned and connected to move the pivoted lever above the pivot in the same direction away from the circuit closing arm and means for energizing an electro-magnetic device acting below the pivot of one pair when the damper has reached a. rst predetermined position beyond the midposition in opening and to energize the other electro-magnetic device of the same pair -whenthe damper has reached a second predetermined positioninopeninr l -V 4.V In a heating and Ventilating system, in combination: j'a thermostatic device positioned in a space to be heated; a source of heated air, a duct formed with an opening in its side and extending from the source of heated vair tothe space-to be heated; adamper in the duct adapted to benmoved to a plurality `of positions to close'the Aby-pvassv Iwholly or partially and to close or to open the duct wholly or partially; a motor having an armature and an opening eld winding and a closing -eld winding; connections between the armature and the motor whereby the damper is operated by i' the armature; an insulating drum mechanicallyY connectedto and oscillatable. with the armature,

said drum bearing a plurality of spaced vmetallic segments;` electrical conducting brushes positioned to contact said segments in denite oscillated positionsthereof; an opening eld relay and a' y closing field relay; a circuit closing arm connected toand movable by said thermostatic device; two

-contact' points, one positioned on one side of said circuit closing arm and the other positioned on rthe other'side thereof; a source of electrical po- J tential and conductors connecting the several de- .vices whereby when the circuit closing arm is moved in one direction the damper -is moved. toward open position and when moved in the other assenso ,direction the damper imredtqward 9195s.@ position, means to prevent furthemovementof `-the damper after it has .assumed 'afposition i, corresponding to the then positionof the switcharm,

two centrally pivoted levers, one bearing one contact and the other. bearing thef othe'rfhontact; V two fpairs of electro-magnetic. devicesgone ,pair 4cooperating withone .pivoted leverlandone with the other, one oi each pair positioned to vac nits *associated pivoted lever above the pivot 'andlone of each pair positioned to act on its associated pivoted lever below ythe pivot iandboth positioned and connected to movethe pivoted lever ahove'the pivot in the same direction away from' the cir` 'j closing arm, Vmeans for.v energizing VanMelefcQt'romagnetic device acting below the p ivQt'jofM onepair when the damper has. reached amatuer dei minedpositon beyondihe. midevosition.

.ing and' t0 energize vthe other, .Electrol-'magnetic c levice of the samepair.whenthedamper has ,reached a second predeterminedposition inlopen- 

